Investigating the Effect of Climate Change on Stormwater Networks: Capital Ankara Case

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Oruç s., YÜCEL İ., YILMAZ A.

Turkish Journal of water science and management, 2020 (Peer-Reviewed Journal)


In this study, we applied the analysis results of past and future variations of extreme precipitation and land use/cover changes in Ankara province for a newly built stormwater network of a pilot study area in Etimesgut, Ankara. We investigated the performances of the system under current and changing extreme rainfall conditions and different approaches such as stationary and nonstationary extreme precipitation assumptions. The system operated in a satisfactory state and it can be said that according to climate change projections for the extreme rainfall, the maximum volume that the system face will not exceed baseline design criteria throughout the projection period. Combination of changing climatic and land use/cover conditions also reveals a satisfactory performance for the baseline design which used 15 minutes storm duration and 2 years return period rainfall intensity and a runoff coefficient of 0,8 as design input. On the other hand, the system may fail under the loads derived separately or together with longer storm duration (such as 30 minutes or more) or higher return periods (such as 5 years and more) that is computed from stationary and nonstationary observed data analysis which is a preferred design input for such a critical facility and area.